package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Override
    /*
     * 新增菜品和对应的口味数据
     * */
    @Transactional//事务注解，原子性成功，两个表
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表插入一条数据
        dishMapper.insert(dish);
        Long dishId=dish.getId();
        //向口味表插入n条数据
        List<DishFlavor> flavors=dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });//将dishId赋值
            //向口味表插入n条数据,批量插入
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /*
    * 菜品分页查询
    * */
    @Override
    public PageResult PageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //开始分页
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        //分页查询
        Page<DishVO> page=dishMapper.PageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }
    /*
     * 菜品批量删除
     * */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //菜品是否存在启售中
        for (Long id : ids) {
            Dish dish=dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                //当前启售，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //菜品是否被某个套餐关联了
        List<Long> setmealIds=setmealDishMapper.getSetmealIdByDishId(ids);
        if(setmealIds != null && setmealIds.size()>0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中的菜品数据
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            //删除菜品关联的口味表中的数据
//            dishFlavorMapper.deleteByDishId(id);
//        }
        //根据菜品id集合批量删除菜品数据
        dishMapper.deleteByIds(ids);
        //删除菜品关联的口味表中的数据
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /*
     * 根据id查询菜品和口味数据
     * */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //先查菜品表查基础的值
        Dish dish=dishMapper.getById(id);
        //再查询口味表
        List<DishFlavor> dishFlavors=dishFlavorMapper.getByDishId(id);
        //将数据封装到vo
        DishVO dishVO=new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        //根据id修改菜品表
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.updateById(dish);
        //根据id修改口味表，先全部删掉再加入
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味数据
        List<DishFlavor> flavors=dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });//将dishId赋值
            //向口味表插入n条数据,批量插入
            dishFlavorMapper.insertBatch(flavors);
        }
    }
}
